Davy's Apparatus for Decomposing and Recomposing Water

Humphy Davy's "apparatus for
decomposing and recomposing water under oil." The components are
labeled: "CC, the wires for communicating the Voltaic
electricity; DD, the wires for producing the explosion; B, the
tube; A, the vessel containing it. a d c, the level of
the different fluids."